Keeps Ticking Over

Police officers walk near a crime scene in Watertown after a tense night of police activity that left a university officer dead on campus just days after the Boston Marathon bombings. Photograph: Matt Rourke/AP

I spent an hour or so last night, just scanning Twitter trying to get news updates on what was happening in Boston, at MIT, at Watertown. It was terrifying, even at a distance; the idea that all of this was happening in the same week and might be disconnected from each other felt like something terrible was happening, something impossible to understand.